Testing if gravity changes on a universal scale
In short: Researchers are exploring whether Einstein's theory of general relativity holds true across the entire universe or only within our local neighborhood. While general relativity has been tested accurately in our Solar System, observations showing that the universe's expansion is accelerating suggest that we may need new theories to explain gravity on a cosmological scale.
This review examines modified gravity models—like f(R) gravity and Horndeski theory—which propose that gravity behaves differently at massive scales without requiring mysterious dark energy. The study analyzes how these models use screening mechanisms to remain consistent with local observations while leaving distinct signatures in the formation of galaxies and clusters.
The paper synthesizes existing constraints from linear perturbations and astrophysical structures. As a review, it summarizes current progress rather than presenting new experimental data.
Why it matters: Understanding whether gravity changes on a cosmic scale helps scientists determine if our fundamental laws of physics are complete.
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Sources
- Summary by Intellect · source: Research: Koyama (2016). Cosmological tests of modified gravity. Reports on Progress in Physics.
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